arm/include/param.h

/*	$NetBSD: param.h,v 1.7 2003/11/09 08:27:19 scw Exp $	*/

/*
 * Copyright (c) 1994,1995 Mark Brinicombe.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the RiscBSD team.
 * 4. The name "RiscBSD" nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef	_ARM_PARAM_H_
#define	_ARM_PARAM_H_

/*
 * Machine dependent constants for all ARM processors
 */

/*
 * For KERNEL code:
 *	MACHINE must be defined by the individual port.  This is so that
 *	uname returns the correct thing, etc.
 *
 *	MACHINE_ARCH may be defined by individual ports as a temporary
 *	measure while we're finishing the conversion to ELF.
 *
 * For non-KERNEL code:
 *	If ELF, MACHINE and MACHINE_ARCH are forced to "arm".
 */

#if defined(_KERNEL)
#ifndef MACHINE_ARCH			/* XXX For now */
#ifndef __ARMEB__
#define	_MACHINE_ARCH	arm
#define	MACHINE_ARCH	"arm"
#else
#define	_MACHINE_ARCH	armeb
#define	MACHINE_ARCH	"armeb"
#endif /* __ARMEB__ */
#elif defined(__ELF__)
#undef _MACHINE
#undef MACHINE
#undef _MACHINE_ARCH
#undef MACHINE_ARCH
#define	_MACHINE	arm
#define	MACHINE		"arm"
#ifndef __ARMEB__
#define	_MACHINE_ARCH	arm
#define	MACHINE_ARCH	"arm"
#else
#define	_MACHINE_ARCH	armeb
#define	MACHINE_ARCH	"armeb"
#endif /* __ARMEB__ */
#endif /* __ELF__ */
#endif /* _KERNEL */

#define	MID_MACHINE	MID_ARM6

/*
 * Round p (pointer or byte index) up to a correctly-aligned value
 * for all data types (int, long, ...).   The result is u_int and
 * must be cast to any desired pointer type.
 *
 * ALIGNED_POINTER is a boolean macro that checks whether an address
 * is valid to fetch data elements of type t from on this architecture.
 * This does not reflect the optimal alignment, just the possibility
 * (within reasonable limits).
 *
 */
#define ALIGNBYTES		(sizeof(int) - 1)
#define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
#define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
/* ARM-specific macro to align a stack pointer (downwards). */
#define STACKALIGNBYTES		(8 - 1)
#define STACKALIGN(p)		((u_int)(p) &~ STACKALIGNBYTES)

#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define	DEV_BSIZE	(1 << DEV_BSHIFT)
#define	BLKDEV_IOSIZE	2048

#ifndef MAXPHYS
#define	MAXPHYS		65536		/* max I/O transfer size */
#endif

/* pages ("clicks") to disk blocks */
#define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
#define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
/*#define	dtob(x)	((x) << DEV_BSHIFT)*/

#define	ctob(x)	((x) << PGSHIFT)

/* bytes to pages */
#define	btoc(x)	(((x) + PGOFSET) >> PGSHIFT)

#define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
	((bytes) >> DEV_BSHIFT)
#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((db) << DEV_BSHIFT)

/*
 * Map a ``block device block'' to a file system block.
 * This should be device dependent, and should use the bsize
 * field from the disk label.
 * For now though just use DEV_BSIZE.
 */
#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))

/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than NBPG (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#define	MSIZE		256		/* size of an mbuf */

#ifndef MCLSHIFT
#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
					/* 2K cluster can hold Ether frame */
#endif	/* MCLSHIFT */

#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */

#endif /* _ARM_PARAM_H_ */